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Videos show details of Tucson shooting
With little help coming from the immediate family, investigators are probing associates and witnesses for details that could help them fill out the "jigsaw puzzle" of Loughner's life, as one source described it.
It could take weeks for investigators to fully determine Loughner's state of mind in the days before the rampage, officials said. Virtually every member of the FBI's 200-person Phoenix field division, along with 50 additional agents from Washington and Tucson, and more from the Capitol Police and the U.S. Marshals Service, have fanned out across southeastern Arizona. About 130 detectives from the Pima County Sheriff's Department are also involved.
"Did you notice anything that made the hair on the back of your neck stand up?" an FBI agent asked Steven Rayle and his companion, Laura Tennen, who were at the scene.
During the interview in their house, Rayle recalled, the federal agent and a Pima County deputy wanted to know "anything that was odd or spooky" about Loughner's behavior that day.
The videos create a fairly vivid picture of Loughner's alleged movements through the Safeway, which he entered sometime after 9:54 a.m. on Jan. 8, Kastigar said. The footage is now in possession of the FBI, which has declined to release it.
In one video, the gunman, whom police believe is Loughner, emerges from the store's south entrance, then loops around a table set up outside for Giffords's "Congress on Your Corner" event with constituents. He is "hurriedly walking," Kastigar said, then approaches Giffords head on. The first shot struck her just above the left eye and exited through the back of her skull.
"He walks up, goes bang," the Pima County lawman said. "He is maybe 24 to 36 inches away. You can see her go straight down."
The gunman then turns to his left and fires on a crowd of people who are seated or standing in line. They are not seen on this video, but one camera captures muzzle flashes, the source said.
Next the gunman turns back to his right, where 65-year-old Ron Barber, Giffords's district director, and Roll are standing. He shoots Barber, who reaches for his left shoulder.
Then, "Judge Roll starts to push Barber down and lay on top of him, and they start to scamper under the table, but Roll is on top," Kastigar said. "At that point, you can see the suspect shoot Roll. Roll gets shot in the back, then he sort of appears halfway on the other side of the table. He starts to look over his right shoulder, and then he lays back down."
Witnesses have given differing accounts of whether Roll was trying to protect Barber.
Giffords's communication director, C.J. Karamargin, said he could not comment on the sources' description of the video. "We're not going to comment on something we haven't seen," he said.